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United States Patent | 5,044,831 |
Myles ,   et al. | * September 3, 1991 |
In a method of soil nailing a soil nail is placed in the ground by being fired from a barrel of a launcher, the method including the steps of loading the nail into the barrel with the nail being a loose fit in the barrel, providing the nail with a sabot which is a sliding fit in the barrel, supporting the barrel such that a forward end of the barriel is spaced from the surface of the ground into which the nail is to be fired, admitting pressurized gas to the barrel to apply an accelerating force to the sabot so as to drive the sabot and with it the nail towards the forward end of the barrel, allowing the nail to travel towards the ground surface such that the sabot exits from the barrel thereby discontinuing the accelerating force and allowing the nail to thereafter continue travelling to penetrate and become embedded in the ground under its own momentum.
Inventors: | Myles; Bernard (Gwent, GB); Bridle; Ronald J. (Gwent, GB); Barr; Benjamin I. G. (Cardiff, GB); Campbell; Colin I. (Guildford, GB) |
Assignee: | University College Cardiff Consultants Limited (Cardiff, GB2) |
[*] Notice: | The portion of the term of this patent subsequent to May 21, 2008 has been disclaimed. |
Appl. No.: | 515743 |
Filed: | April 30, 1990 |
Apr 28, 1989[GB] | 8909837 |
Current U.S. Class: | 405/259.1; 124/56; 227/130; 405/302.4 |
Intern'l Class: | E21D 020/00; E21D 021/00; F21B 011/00 |
Field of Search: | 405/258,259 124/56 114/295 227/10,15,130 173/90,129,132 254/29 R |
2512831 | Jun., 1950 | Holmes | 405/239. |
3802204 | Apr., 1974 | Mason. | |
3819101 | Jun., 1974 | Elders et al. | 405/259. |
4005811 | Feb., 1977 | Garaty | 227/130. |
4033419 | Jul., 1977 | Pennington | 405/259. |
4313695 | Feb., 1982 | McCartney | 405/259. |
Foreign Patent Documents | |||
39654 | Nov., 1981 | EP. | |
0278936 | Aug., 1988 | EP. | |
2447424 | Aug., 1980 | FR. | |
7702212 | Feb., 1977 | NL. | |
627835 | Aug., 1949 | GB. | |
1580142 | Nov., 1980 | GB. | |
2058182 | Apr., 1981 | GB. | |
2188958 | Oct., 1987 | GB. |
Trauaux, vol. 11, No. 553, Mar. 1981, pp. 76-81, G. Verrier et al., p. 78, Paragraphs 5.1.3, 5.1.4; FIGS. 1-5, 7. "Soil Nailing-Application and Practice--Part I", Ground Engineering, vol.-19(8), Nov. 86 and Part 2, vol. 20(1), Jan. 87. "Soil Nailing--The Second Decade"--International Conference on Foundations and Tunnels, London, 1987. "Soil Nailing" C. R. Coll. Int. Reinforcement Des Sols, Paris, 1979. |